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how to avoid positive feedback in sound systems ?

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Alwaleed2

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how to avoid positive feedback in sound systems ? is there any circuitry for that or just organize the speaker system to avoid it
 

Frequency shift by +\-10Hz allows about 3dB increase in volume without feedback.

Automatic notch filter allows 6-10dB volume increase before feedback.

DSP echo cancelation allows maybe 30dB increase in volume before feedback.
 

thanks ,

What the Bass & Treble Pots are used for in most Power Amps ?
 

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